Dual-control apparatus



Dec. 1l, 1928,

, l 1,694,916 J. T. HICKMAN DUAL CONTROL APPARATUS Filed June 3o, 1924 J'wg fic/Wm @j Patented Dec.A 1l 1928.

UNITED srATrsfPA'rl-:NT OFFICE..

; IJosnrir '.r. HIcxMAN, orWAsHINGToN, 'DISTRICT or COLUMBIA.

. DUAL-CONTROL APPARATUS.

Application tiled .Tune 30, 1924. SeralNo. 723.271. Y

My invention relates to radio receivers, transmitters and other elcctricalor'mechanical devices requiring the operation ot two or more'controls.substantially in unison with 6 each other, and has for an object the providing of an eicient means foroperating a plu rality of controls.

A further object of my invention is to provide a means whereby two or more controls 10 may be operated separately or in unison.

With these and' ot-herobjects in view, -the invention consists in the combination, construction and arrangementot parts as will..

hereinafter be fully described.

Reference is to be had to the accompanying drawings, forming a part of this specica? tion in' which like reference characters indicatefcorresponding parts throughout the several views, and inwhich I l Figure 1 is a broken front View of the panel ofaradio' instrument. Figure. 2 is a sectional view of my invention.

Figure 3 :is a clutch members. Figure 4| is a perspective view 'of the pulley. f Y

' Figure 5 is a broken rear view of the. panel perspective view of the and b elt.

)Vhilethis procedure can still lbe 'followed when using my invention, I have made it possiblel to operate all controls with any single one oftltem.

Referring to the drawings (1) is al dial, graduated so that the setting may easily be determined. Attached to the dial in any suitable manner is a knob (2) preferably of hard' rubber. The knob has an annular space through its center inwhich is closely fitted a metallic member (3), also attached to the dial (2). Member (3) containsV a recessed annular space inwhichhollow shaft (4) is free to slide when pressure on knob (2) is exerted. Hollow shaft (4) contains a slot (5), through which pin 6i, securely of a 4radio instrument, showing the pulleysy Heretofore, when tuning a radio receiver' the sides of causing `slia'iit (7), which 9 and to the inner end Knob (2) and member (3) (7), extends. When knob 5o Kuo-b (2) is kept Iin an outward position, as

illustrated in Figure 2 by spring 10, The

tension on this spring may be adjusted by screw (11) which is threaded through the end of member (3). and screw,(1l

ven-ts the spring grabbing sures smooth running.

i Between Spring (lo) 1s ya washer the screw and in- The inner end ofv shaft (4) contains a clutch cone (13), .through ward' pressure is applied to knob (2), is compressed, and clutch cone control.

l The pulley (14), l.about shaft which engages v pulle 14 tension ofspring' (10). y 7

l/Vhen inspring (13) is to release from pulley (14), therecontains grooves (17) in which the `belt (16) runs. Either a single belt wrapped twice about the intermediate pulley or separate belts between the pulleys,

may be used.

By turning the knob (2) of any control, it being in its outward position, all controls are turned 1n unison.

l'Vlnle I have described my invention as applied to a radio receiver, with equal eclen-c-y to it can be applied` other electrical oki-mechanical device requiring unison of movement and it is to be understood that the above ldescription and accompanying drawings comprehend' only the general and preferred embodiment of my invention and tha-t various changes in details ot' construction, proportion and arrangement of parts may be made within the scope of the appended `claims without sacrifcing any of4 tion.

the advantages of my invencluding,

in combination, a plurality of rotatwhich prey a transmitter or which is. free to rotate i able members, pulleys' rotatably mounted with the members, cables trained over lthe pulleys, elements for operating ,the rotatable members, and clutches controllable by the 5 'elements for rotating the pulleys.

2. A mechanismv of the classdescribed in cluding, in combination, a plurality of rot atable members, pulleys rotatably associatcd with the members, means operatively con necting the pulleys, elements for operating the rotatable members and clutches controllable by the element-s for rotating the pulleys.

JOSEPH T. HICKMAN. 

